The effectiveness of beach mega-nourishment, assessed over three management epochs

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:184

Article

Brown, Jennifer M.¹  Phelps, Jack J. C.^1,2  Barkwith, Andrew³  Hurst, Martin D.^3,4  Ellis, Michael A.³  Plater, Andrew J.² 

[1] Natl Oceanog Ctr, Liverpool L3 5DA, Merseyside, England

[2] Univ Liverpool, Dept Geog & Planning, Liverpool L69 7ZT, Merseyside, England

[3] British Geol Survey, Nottingham NG12 5GG, England

[4] Univ Glasgow, Sch Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland

关键词: Beach mega-nourishment;    Coastal resilience;    Shoreline evolution;    Shoreline management planning;    Coastal evolution model;    Dungeness;   

DOI  :  10.1016/j.jenvman.2016.09.090

来源: Elsevier

【 摘 要 】

Resilient coastal protection requires adaptive management strategies that build with nature to maintain long-term sustainability. With increasing pressures on shorelines from urbanisation, industrial growth, sea-level rise and changing storm climates soft approaches to coastal management are implemented to support natural habitats and maintain healthy coastal ecosystems. The impact of a beach mega nourishment along a frontage of interactive natural and engineered systems that incorporate soft and hard defences is explored. A coastal evolution model is applied to simulate the impact of different hypothetical mega-nourishment interventions to assess their impacts' over 3 shoreline management planning epochs: present-day (0-20 years), medium-term (20-50 years) and long-term (50-100 years). The impacts of the smaller interventions when appropriately positioned are found to be as effective as larger schemes, thus making them more cost-effective for present-day management. Over time the benefit from larger interventions becomes more noticeable, with multi-location schemes requiring a smaller initial nourishment to achieve at least the same benefit as that of a single-location scheme. While the longer-term impact of larger schemes reduces erosion across a frontage the short-term impact down drift of the scheme can lead to an increase in erosion as the natural sediment drift becomes interrupted. This research presents a transferable modelling tool to assess the impact of nourishment schemes for a variety of sedimentary shorelines and highlights both the positive and negative impact of beach mega nourishment. (C) 2016 The Authors. Published by Elsevier Ltd.

【 授权许可】

Free